Junior Quantum Measurement Engineer

Founded in 2020 and based in the heart of Paris, C12’s mission is to be at the center of one of the biggest technological breakthroughs of the century and change the course of history by building a universal quantum computer. At C12 we believe that achieving a true breakthrough in quantum computing requires rethinking the fundamentals. That’s why our founders, deeply rooted in academic and engineering excellence, have chosen carbon nanotubes as the building blocks of our quantum processors. This ultra‑pure material dramatically reduces error rates, boosts performance and minimizes hardware overhead—key ingredients for scalable fault‑tolerant quantum computing. By crafting a unique approach that scales, we aim to revolutionize quantum computing just as silicon transformed classical computing. Since our founding we’ve raised over 25 million in funding, published 11 scientific papers and secured 8 patents. Today our fast‑growing team of 60—including 20 PhDs—has over 20 nationalities represented. We have our own cutting‑edge lab spaces in Paris’s historic Panthéon district where scientists, engineers and innovators work side‑by‑side to tackle some of the most exciting technical challenges of our time. If you’re passionate about shaping the future of quantum technology and want to make a real impact, C12 offers a unique environment to grow, learn and innovate. Your role at C12 Quantum Electronics: As part of the Quantum Measurement team at C12 you will: Design, integrate and optimize cryogenic quantum measurement systems, combining microwave electronics, biasing and wiring solutions to ensure precise, calibrated, low‑noise signal performance across DC to high‑frequency domains. Develop and innovate in experimental control, data acquisition and system automation to maximize measurement fidelity, reproducibility and overall technical excellence. Perform DC and RF measurements at cryogenic temperatures on carbon‑nanotube quantum devices integrated into high‑impedance cQED platforms under supervision. Develop scalable data‑acquisition and analysis pipelines, establishing rigorous documentation standards for high‑quality experimental outcomes. About You: At least a Master’s degree or comparable experience in electrical engineering, experimental physics or a closely related discipline. Direct practical experience with DC and RF/MW hardware, emphasizing real‑world implementation over purely theoretical or simulated approaches. Experience with low‑noise and high‑bandwidth electronics. Skilled in Python for instrument control, experiment automation and data acquisition. Quick to learn new concepts in quantum measurement and physics. Collaborative team player who bridges engineering and science effectively. Strong communication skills in English (oral and written). What we offer: Stock options for every employee (BSPCE/ESOP). Two incredible office spaces in the heart of Paris (both next to the famous Panthéon). Sponsored trips to conferences around the world. A highly dynamic international team. Swile meal vouchers. Vibrant office culture (team lunches, off‑site events, Friday breakfasts). Mental health support. Training budgets/annual learning & development allowance. Sabbatical leave (after 2 years in the company). You should join us if... You like hands‑on work and technology. You want to contribute to achieving landmark results in quantum computing and make a difference in emerging quantum technologies. You want to work within a 60‑person team with backgrounds in nanofabrication, quantum electronics and carbon‑nanotube science to create a revolutionary quantum computing processor. You want to thrive in an exceptional scientific environment with several industrial and academic partners. You share our values (excellence, scientific integrity, diversity, curiosity and care) and want to help us define our product‑focused culture and ambition to accelerate. C12 encourages all who feel qualified to apply. Recruitment decisions are based solely on qualifications, skills, knowledge and a non‑discriminatory process. Women are particularly welcomed. We may use AI tools to support parts of the hiring process such as reviewing applications, analyzing resumes or assessing responses. These tools assist our recruitment team but do not replace human judgment. #J-18808-Ljbffr